Metal powder bed additive manufacturing method for grain refinement

Abstract

The invention relates to a metal powder bed additive manufacturing method for refining crystal grains. Including: building a 3D model of the workpiece to be processed; slicing the 3D model and planning the scanning path according to the slice data; preheating the powder bed forming base plate before powder spreading; laying metal powder on the preheated powder bed forming base plate On the above, preheating the metal powder forming area; performing selective melting scanning on the preheated metal powder according to the scanning path, the first scanning path and the second scanning path start along the first direction in sequence Scan multiple first scan lines and multiple second scan lines. After starting to scan, each scan is completed Δt After the first scan of the line of time, it is required to complete the scan Δt The second scanning line of time until the scanning is completed to obtain a single-layer solid sheet; repeat the above-mentioned preheating process before powder spreading, powder spreading process, preheating process after powder spreading, and selective melting scanning process until the single-layer solid sheet is layer by layer Stack to get the target workpiece.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a metal powder bed additive manufacturing method for refining crystal grains. Background technique [0002] Metal powder bed additive manufacturing technology is a technology with short cycle, less process, low cost and net shape. Its formed components have excellent mechanical properties and have great scientific research value and economic benefits. Its application range is quite wide, especially for refractory and difficult-to-process materials, including titanium alloys, titanium-based intermetallic compounds, stainless steel, cobalt-chromium alloys, nickel alloys, etc., and its products can achieve high complexity and high mechanical properties. With the continuous development of metal powder bed additive manufacturing technology, more and more metal materials are added to the field of additive manufacturing printing. For example, in the nuclear industry, zirc...

AI Technical Summary

Problems solved by technology

[0003] This development is bound to bring new problems to a certain extent. For example, due to the applicability of new materials and the application of additive manufacturing technology, and the poor matching of additive manufacturing technology, the use of additive manufacturing technology has coarse grains and poor fusion. Uniformity, porosity, etc.

[0004] Traditional grain refinement methods mainly use heat treatment, adding nucleating agents, multiple rolling, vibration treatment, etc. However, due to the complexity, diversity, and internal structure of metal biological implants or new-generation nuclear structural The variability of the structure and the high requirements of the structure and performance have limited the traditional forging preparation process of metal structural parts, and the cost has also increased significantly.

And due to the flammability and explosion of some metals such as zirconium powder itself, the risk of powder metallurgy processing is relatively high, forming a safety hazard

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